Note 4 - Other Long-term Assets (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Other Assets, Noncurrent [Table Text Block]

	June 30,		December 31,
	2020		2019
Advanced coal royalties	$	6,303	$	6,105
Marketable equity securities available for sale, at fair value (restricted)*		—		2,296
Other		1,866		1,923
Total other assets	$	8,169	$	10,324